.hlp me to solve mcq​

Answer:

Chemicals are substances in any form of matter with a chemical composition and property. Chemical reaction involves the combination of two or more different atoms chemically combined together, which are not easily separated.

Explanation:

CHEMICALS

CHEMICAL REACTIONS

NEITHER

Answer:

of what grade it is of??

Explanation:

tell me then ill answer

Answer:

The baseball is thrown twice as fast as the softball in the same direction.

Explanation:

Answer:

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Explanation:

Volumetric flasks

Volumetric labware is for measuring liquids with precision. Volumetric flasks, burettes, and pipettes made for measuring small amounts of liquid are the most accurate, with tolerances of less than ±0.02.

Answer:

A pipette is a laboratory instrument used to measure out or transfer small quantities of liquid, in volumes of milliliters (mL), microliters (μL).

Answer:

The answer is "Option B"

Explanation:

Law:

In the law of the conservation of matter, states the volume of matter throughout the process remains constant. In any particular case, it is closed to the movement of matter.  It is mostly on conservation of energy means, that the total mass of the products should consider the sum of the mass, which is the reactant of the event of chemical processes.

Reaction:

[tex]2AgClO_3+ Na_2CO_3= Ag_2CO_3+Na_2ClO_3[/tex]

In the above equation when we react to [tex]2AgClO_3[/tex] from the [tex]Na_2CO_3[/tex], it will give [tex]Ag_2CO_3 \ \ \text{and} \ \ Na_2ClO_3[/tex]. that's why option b is correct.

Answer:

Ag2CO3

Explanation:

Answer:

1=4

2=2

3=hydrogen bonding

4=SO2 is reduced to Sulphur

Explanation:

Answer:

C

Explanation:

1 lb is 0.0005 T. So if you can do the math, (1500x.0005) it comes out to 0.75 T.

Answer:

electrons are knocked off atoms, causing electricity to flow.

Explanation:

[tex]\\ \rm\longmapsto 9.7300\times 10^2+9.8700\times 10^3[/tex]

[tex]\\ \rm\longmapsto 9.73\times 10^4+9.87\times 10^3[/tex]

[tex]\\ \rm\longmapsto 19.6\times 10^{4+3}[/tex]

[tex]\\ \rm\longmapsto 19.6\times 10^7[/tex]

Answer:

1.0843 × 10^4

Explanation:

9.7300 × 10^2 + 9.8700 × 10^3

= 10843

1.0843 × 10^4

= 10843

Taking into account the definition of molecular geometry, the correct option is option d.:  the bond angle of a linear molecule is 180 degrees.

In first place, molecular geometry or molecular structure is the spatial distribution of atoms around a central atom. Atoms represent regions where there is a high electron density, and are therefore considered electronic groups, regardless of the bonds they form.

That is, molecular geometry is the three-dimensional arrangement of the atoms that make up a molecule.

The molecular geometry of an element characterizes some of its physical or chemical properties, such as boiling point, viscosity, and density.

Linear molecules are molecules of the AB₂ type in which the central atom does not have lone pairs. To avoid repulsions between the binding pairs, arrange the B groups as far apart as possible. For that they must oppose each other 180 °.

In summary, linear molecular geometry describes the arrangement of different atoms with 180º bonds.

So, the correct option is option d.:  the bond angle of a linear molecule is 180 degrees.

Learn more about molecular geometry with this example:

Answer:

Heat is included as one of the products for eg:

C+O2 gives CO2 + heat

hope it helps!

Answer:

Explanation:

25 yard [3 feet / 1 yard] [12 inches / 1 foot] = 25 * 3 * 12 = 900 inches in 25 yards.

Always put the unit you are going to on top and the unit you are coming from on the bottom.

So in this example, you want to going to feet to start with. That's on top. Yards are on the bottom of the first bracket.  In second bracket feet are on the bottom, inches are what you are going to on the top.

Heat is transferred through convection by the movement of a liquid or gas and is denoted as option D.

this is defined as the process of heat flow through a fluid which include a liquid or gas.

This process doesn't involve contact between the object unlike in conduction. A typical example is the heat flow which occurs in the atmosphere thereby making it the most appropriate choice.

Read more about Convection here https://brainly.com/question/9382711

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Answer:

A

Explanation:

Its an acid.

Hey there !

Mass = 237 g

Volume 237 mL

Therefore:

Density = mass / Volume

D = 237 / 237

D = 1.0 g/mL

Hope this helps!

Answer:

The answer is the same as .

Explanation:

There are 3 atoms in NaOH, 1 sodium, 1 oxygen and 1 hydrogen.

There are 3 atoms in H2O, 2 hydrogen and 1 oxygen.

Answer:

The particles of frosting absorbed energy from their surroundings and changed from the solid to the liquid state.

Explanation:

On a sunny day, the energy of the particles in the surrounding is higher than the energy of the frosting tray of cupcakes.

As a result of the exchange of energy between the tray of cupcakes and the surrounding, the tray of cupcakes absorbs energy from the surrounding. When this occurs, the firm frosting is now converted from solid to liquid which is runny and wet to touch, hence the answer above.

Answer:

I think its sugar breaking down into watee and carbon when it is heated

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Explanation:

Heat, Oxygen and Fuel

hope it helps u

Answer:

a friction helps to cause fire and oxygen helps to increase it

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According to Charles law

[tex]\boxed{\sf \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}[/tex]

[tex]\\ \sf\longmapsto \dfrac{48}{159.6}=\dfrac{V_2}{4.9}[/tex]

[tex]\\ \sf\longmapsto V_2=\dfrac{48\times 4.9}{159.6}[/tex]

[tex]\\ \sf\longmapsto V_2=\dfrac{235.2}{159.6}[/tex]

[tex]\\ \sf\longmapsto V_2=1.4mL[/tex]

Answer:

Halogens

Explanation:

Matter is defined as a substance which has mass and occupies volume. The three states of matter are solid, liquid and gas.

Elements which are present in group 17 are known as halogens.

Elements present in this group are fluorine, chlorine, bromine and iodine.

At room temperature, both fluorine and chlorine exists as a gas.

Bromine exists as a liquid and iodine exists as a solid.

Therefore, we can conclude that halogen groups are likely to have elements in three states of matter.

Answer:

Electron gain enthalpy becomes more and more negative from left to right in a period. As we move across a period from left to right the atomic size decreases and the nuclear charge increases

Answer: Variation in electron gain enthalpy in the period : in the modern periodic table, on moving from left to right across a period the atomic size of elements decreases and the effective nuclear charge increases.

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Explanation:

Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

Answer:

1.the law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

Explanation:

2.Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses. Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table.

Object named H is harder than Object F due to its thickness.

The object of material H is harder than the object of material F due to the difference in thickness. The thickness of Material Object H is 3 millimeters compared to Material Object F which is 1 millimeter thick, so applying the same amount of force on both objects, Material Object H does not show any change in its structure while on the other hand, the shape of the object F changes due to a lower hardness.

https://brainly.com/question/24333064

Since perchloric acid is a strong acid, it will dissociate completely, along with water. The products will be Perchlorate ions and Hydronium ions after the Perchloric acid gave away its proton and water, acting as a base, accepted that abandoned proton.